Photon spheres in dynamical space-timesThe characterization of the photon region -- i.e. the region of space-time filled with unstable bound null geodesics -- is critical to understand the behavior of radiation near a compact-enough…David Díaz-Guerra, Ángel Rincón, Diego Rubiera-Garcia·Jun 1, 2026SaveLearn
Ellis-Bronnikov Wormhole Shadows with Spherically Symmetric Accretion FlowWe investigate the observational differences between the Ellis--Bronnikov (EB) wormhole and the Schwarzschild black hole (BH) by performing general relativistic radiative transfer (GRRT) simulations.…Mikiya M. Takahashi, Keisuke Nakashi·Jun 1, 2026SaveLearn
Gravitational-wave astronomy with a space-based optical clock networkSince the first detection of a merging binary black hole system a decade ago, gravitational-wave astronomy has emerged as a powerful tool for astrophysics. Future space-based observatories, such as…Dhruva Ganapathy, Divya Singh, Sammith Singamsetty et al.·Jun 1, 2026SaveLearn
Waveform degeneracy of binary systems and Lagrange three-body systemsA particular solution to the three-body problem is the circular Lagrange three-body system, where the masses move in circular orbits such that they always constitute an equilateral triangle. Such a…Carlos Jaimel Doctolero, Ian Vega·Jun 1, 2026SaveLearn
Comment: Exact vacuum solution with Hopf structure in general relativityHarada's recently announced Kerr-Schild solution of Einstein's equations in general relativity [Phys. Rev. D 112, 024020 92025)] is identified as isometric with one of the well-known…Malcolm A. H. MacCallum·Jun 1, 2026SaveLearn
Penrose-Rindler equation and horizon thermodynamics of stationary black holesBlack holes are the natural arena for exploring the interplay between gravity and thermodynamics. Although the association between black hole mechanics and black hole thermodynamics is well…Diego Fernández-Silvestre, Alberto Guilabert, Pedro Bargueño et al.·Jun 1, 2026SaveLearn
Gravitational Bound State Perturbations Inside Black Holes and IsospectralityWe study the bound state solutions for the polar perturbations in the interior of the Schwarzschild black hole. It is shown that for a given value of the spherical harmonic index , there are a…Hassan Firouzjahi, Kazem Rezazadeh, Masoud Molaei·Jun 1, 2026SaveLearn
Black hole spacetimes with dark matter spikes: Energy-momentum tensor and backreaction effectsWe study the energy-momentum tensor of a dark matter (DM) spike formed during the adiabatic growth of a black hole embedded in a DM halo, and investigate its backreaction on the spacetime geometry.…Wei Xiong, Peng-Cheng Li·Jun 1, 2026SaveLearn
Analytical Solutions to the Wheeler-DeWitt Equation in Rosen-Lagrangian Cosmology via the Eisenhart LiftThe Rosen Lagrangian framework promotes the cosmological constant to a scale-factor-dependent quantity, Λ(a)=Λ0aλ, thereby providing a dynamical dark energy scenario for λ≠ 0. In the…Narakorn Kaewkhao, Suparat Marit, Phongpichit Channuie·May 31, 2026SaveLearn
Improving the resolution of double white dwarf systems with spaceborne gravitational wave observatories using a robust astrophysical priorResolving the crowded population of double white dwarf (DWD) binaries in data from spaceborne gravitational wave (GW) observatories (e.g., LISA, Taiji) remains a major analysis challenge. Comparable…Shao-Dong Zhao, Xue-Hao Zhang, Soumya D. Mohanty et al.·May 31, 2026SaveLearn
Rotating traversable wormholes and particle dynamics in f(R,T) gravityTraversable wormholes are among the most interesting solutions of gravitational theories, but within General Relativity they generally require exotic matter violating the null energy condition.…G. G. L. Nashed, Waleed El Hanafy, Amare Abebe et al.·May 31, 2026SaveLearn
The Heuristic Approach to General Relativity in the Laplace-Beltrami FormalismThe Laplace-Beltrami formalism, in which the Ricci tensor in the Einstein field equations (EFEs) is formulated at leading-order in terms of the partial-differential Laplace-Beltrami operator, was…Noah M. MacKay·May 31, 2026SaveLearn
Revisiting Schwarzschild's constant density star in isotropic coordinatesHerein we shall revisit the venerable 110-year-old topic of Schwarzschild's constant density star, emphasizing that for many (though not quite all) purposes it is much easier to analyze this…Christopher Simmonds, Matt Visser·May 31, 2026SaveLearn
Planckian Gravitons from an Imaginary-Time ClockWe present a simple derivation of the exact Planck spectrum of the quadrupole radiation from point masses moving apart nonrelativistically, essentially an analog for gravitational radiation. The…Michael R. R. Good, Eric V. Linder·May 31, 2026SaveLearn
Timing-Window Mechanism for Chain-Like Transients in Collisions of Radially Excited Boson StarsWe show that chain-like transients in head-on collisions of radially excited boson stars are controlled by the binary collision time, not by radial excitation alone. For selected \(n=2\), \(λ=400\)…Bo-Xuan Ge·May 31, 2026SaveLearn
Nearly universal CMB TT spectrum from pre-inflationary dynamics in a closed universe: KICI scenario, bouncing universe, and emergent universeWe utilize the phase space analysis method to study the early evolution of the spatially closed universe and find that there exists an attractor denoting the de Sitter expansion phase, and that the…Qihong Huang, Hao Chen·May 31, 2026SaveLearn
Non-Hermitian PT symmetric Klein-Gordon fields in Lorentz-violating wormholes spacetime backgroundWe investigate a PT-symmetric Klein--Gordon (KG) oscillator in a (3+1)-dimensional Lorentz-violating (LV) traversable wormhole spacetime. The geometry is characterized by a smooth…Omar Mustafa, Abdullah Guvendi·May 31, 2026SaveLearn
Early-Time Nonlinear Growth in an Unstable Q-Ball Hairy Black HoleEarly-time evolution away from an unstable equilibrium in a nonlinear system is often expected to be governed by the associated linear instability. Combining full nonlinear evolution with first- and…Lang Cheng, Guangzhou Guo, Peng Wang et al.·May 31, 2026SaveLearn
Non-local gravity effects in cosmological dynamics probed by IceCube/KM3NeT signals and dark matter relic abundanceNon-local gravity terms have a relevant role in determining the cosmological dynamics. Here we consider curvature- and torsion-based cosmological models where non-local terms can be…Salvatore Capozziello, Gaetano Lambiase, Giuseppe Meluccio·May 31, 2026SaveLearn
Spacetime of rotating black holes surrounded by massive scalar chargesMassive scalar charges are ubiquitous in extensions to General Relativity and the Standard Model in particle physics. We describe spectral methods which can accurately construct the spacetime of…Adrian Ka-Wai Chung·May 31, 2026SaveLearn
The bending of a straight lineIn gravitational lensing under the weak-field approximation, the usual viewpoint is that light bending measures how a ray deviates from a straight line in Euclidean space. In this work, we take the…Zonghai Li, Xiao-Jun Gao·May 31, 2026SaveLearn
Alleviating the H0 tension in Rastall gravityThe persistent discrepancy between local determinations of the Hubble constant H0 and the Planck 2018 value (67.4 0.5~ km\,s-1\,Mpc-1) within ΛCDM remains a central challenge in…R. Mohebi, Kh. Saaidi T. Golanbari, K. Karami·May 31, 2026SaveLearn
Bekenstein-Hawking temperature from the SchwarzianHawking's original derivation of particle creation by black holes in Schwarzschild spacetime exploits, among various concepts, the exponential dependence on the retarded time variable u of the…Donato Bini, Giampiero Esposito·May 30, 2026SaveLearn
Searching for a waveform-agnostic gravitational wave signal in pulsar timing arraysPulsar timing arrays have recently provided compelling evidence for a nanohertz stochastic gravitational wave background, motivating searches for gravitational waves from localized sources. Most…Heling Deng, Bence Becsy, Yuri Levin et al.·May 30, 2026SaveLearn
Relativistic transformation of temperature revisitedThe relativistic transformation of temperature has long remained controversial, with the classical laws of Planck-Einstein, Ott-Eddington-Moller and Landsberg yielding conflicting results. We…Soroor Pouryazdan, Babak Vakili·May 30, 2026SaveLearn